Correct backend name from VLLM to accelerate in LightEval example

Author: mcavdar

chapters/en/chapter11/5.mdx

@@ -92,7 +92,7 @@ Example: `"mmlu|abstract_algebra|0|0"` evaluates on MMLU's abstract algebra task
 
 Let's set up an evaluation pipeline for our finetuned model. We will evaluate the model on  set of sub tasks that relate to the domain of medicine. 
 
-Here's a complete example of evaluating on automatic benchmarks relevant to one specific domain using Lighteval with the VLLM backend:
+Here's a complete example of evaluating on automatic benchmarks relevant to one specific domain using Lighteval with the accelerate backend:
 
 ```bash
 lighteval accelerate \